mapillary_download/csv_to_geojson.ts

import fs from 'fs';
import path from 'path';
import csvParser from 'csv-parser';
import minimist from 'minimist';
import { Feature, FeatureCollection, Point } from 'geojson';

interface Options {
  dir: string;
  file: string;
  latColumn: string;
  lonColumn: string;
  hasHeaders: boolean;
}

/**
* @name csvToGeoJSON
* @description conversion de csv vers geojson
*
* Utilisation: 
* node csv_to_geojson.ts -d ./etalab_data/panneaux -f mon_fichier.csv -lat GPSLatitude -lon GPSLongitude -h
* 
**/
function csvToGeoJSON(options: Options): FeatureCollection<Point> {
  const { dir, file, latColumn, lonColumn, hasHeaders } = options;
  const filePath = path.join(dir, file);
  const features: Feature<Point>[] = [];

  fs.createReadStream(filePath)
    .pipe(csvParser({ headers: hasHeaders }))
    .on('data', (row) => {
      const lat = parseFloat(row[latColumn]);
      const lon = parseFloat(row[lonColumn]);
      features.push({
        type: 'Feature',
        geometry: {
          type: 'Point',
          coordinates: [lon, lat],
        },
        properties: row,
      });
    })
    .on('end', () => {
      const geoJSON: FeatureCollection<Point> = {
        type: 'FeatureCollection',
        features,
      };
      fs.writeFileSync(`${file}.geojson`, JSON.stringify(geoJSON, null, 2));
      console.log(`GeoJSON créé avec succès : ${file}.geojson`);
    });

  return features;
}

const args = minimist<Options>(process.argv.slice(2), {
  alias: {
    dir: 'd',
    file: 'f',
    latColumn: 'lat',
    lonColumn: 'lon',
    hasHeaders: 'h',
  },
  default: {
    hasHeaders: true,
  },
});

csvToGeoJSON(args);